diff options
| -rw-r--r-- | Makefile | 1 | ||||
| -rw-r--r-- | drivers/core/Makefile | 7 | ||||
| -rw-r--r-- | drivers/core/device.c | 348 | ||||
| -rw-r--r-- | drivers/core/lists.c | 155 | ||||
| -rw-r--r-- | drivers/core/root.c | 102 | ||||
| -rw-r--r-- | drivers/core/uclass.c | 285 | ||||
| -rw-r--r-- | drivers/core/util.c | 37 | ||||
| -rw-r--r-- | include/asm-generic/global_data.h | 8 | ||||
| -rw-r--r-- | include/dm.h | 14 | ||||
| -rw-r--r-- | include/dm/device-internal.h | 87 | ||||
| -rw-r--r-- | include/dm/device.h | 159 | ||||
| -rw-r--r-- | include/dm/lists.h | 39 | ||||
| -rw-r--r-- | include/dm/platdata.h | 22 | ||||
| -rw-r--r-- | include/dm/root.h | 53 | ||||
| -rw-r--r-- | include/dm/uclass-id.h | 28 | ||||
| -rw-r--r-- | include/dm/uclass-internal.h | 85 | ||||
| -rw-r--r-- | include/dm/uclass.h | 142 | ||||
| -rw-r--r-- | include/dm/util.h | 29 |
18 files changed, 1601 insertions, 0 deletions
@@ -591,6 +591,7 @@ libs-y += fs/ libs-y += net/ libs-y += disk/ libs-y += drivers/ +libs-$(CONFIG_DM) += drivers/core/ libs-y += drivers/dma/ libs-y += drivers/gpio/ libs-y += drivers/i2c/ diff --git a/drivers/core/Makefile b/drivers/core/Makefile new file mode 100644 index 0000000..90b2a7f --- /dev/null +++ b/drivers/core/Makefile @@ -0,0 +1,7 @@ +# +# Copyright (c) 2013 Google, Inc +# +# SPDX-License-Identifier: GPL-2.0+ +# + +obj-$(CONFIG_DM) := device.o lists.o root.o uclass.o util.o diff --git a/drivers/core/device.c b/drivers/core/device.c new file mode 100644 index 0000000..55ba281 --- /dev/null +++ b/drivers/core/device.c @@ -0,0 +1,348 @@ +/* + * Device manager + * + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <malloc.h> +#include <dm/device.h> +#include <dm/device-internal.h> +#include <dm/lists.h> +#include <dm/platdata.h> +#include <dm/uclass.h> +#include <dm/uclass-internal.h> +#include <dm/util.h> +#include <linux/err.h> +#include <linux/list.h> + +/** + * device_chld_unbind() - Unbind all device's children from the device + * + * On error, the function continues to unbind all children, and reports the + * first error. + * + * @dev: The device that is to be stripped of its children + * @return 0 on success, -ve on error + */ +static int device_chld_unbind(struct device *dev) +{ + struct device *pos, *n; + int ret, saved_ret = 0; + + assert(dev); + + list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) { + ret = device_unbind(pos); + if (ret && !saved_ret) + saved_ret = ret; + } + + return saved_ret; +} + +/** + * device_chld_remove() - Stop all device's children + * @dev: The device whose children are to be removed + * @return 0 on success, -ve on error + */ +static int device_chld_remove(struct device *dev) +{ + struct device *pos, *n; + int ret; + + assert(dev); + + list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) { + ret = device_remove(pos); + if (ret) + return ret; + } + + return 0; +} + +int device_bind(struct device *parent, struct driver *drv, const char *name, + void *platdata, int of_offset, struct device **devp) +{ + struct device *dev; + struct uclass *uc; + int ret = 0; + + *devp = NULL; + if (!name) + return -EINVAL; + + ret = uclass_get(drv->id, &uc); + if (ret) + return ret; + + dev = calloc(1, sizeof(struct device)); + if (!dev) + return -ENOMEM; + + INIT_LIST_HEAD(&dev->sibling_node); + INIT_LIST_HEAD(&dev->child_head); + INIT_LIST_HEAD(&dev->uclass_node); + dev->platdata = platdata; + dev->name = name; + dev->of_offset = of_offset; + dev->parent = parent; + dev->driver = drv; + dev->uclass = uc; + if (!dev->platdata && drv->platdata_auto_alloc_size) + dev->flags |= DM_FLAG_ALLOC_PDATA; + + /* put dev into parent's successor list */ + if (parent) + list_add_tail(&dev->sibling_node, &parent->child_head); + + ret = uclass_bind_device(dev); + if (ret) + goto fail_bind; + + /* if we fail to bind we remove device from successors and free it */ + if (drv->bind) { + ret = drv->bind(dev); + if (ret) { + if (uclass_unbind_device(dev)) { + dm_warn("Failed to unbind dev '%s' on error path\n", + dev->name); + } + goto fail_bind; + } + } + if (parent) + dm_dbg("Bound device %s to %s\n", dev->name, parent->name); + *devp = dev; + + return 0; + +fail_bind: + list_del(&dev->sibling_node); + free(dev); + return ret; +} + +int device_bind_by_name(struct device *parent, const struct driver_info *info, + struct device **devp) +{ + struct driver *drv; + + drv = lists_driver_lookup_name(info->name); + if (!drv) + return -ENOENT; + + return device_bind(parent, drv, info->name, (void *)info->platdata, + -1, devp); +} + +int device_unbind(struct device *dev) +{ + struct driver *drv; + int ret; + + if (!dev) + return -EINVAL; + + if (dev->flags & DM_FLAG_ACTIVATED) + return -EINVAL; + + drv = dev->driver; + assert(drv); + + if (drv->unbind) { + ret = drv->unbind(dev); + if (ret) + return ret; + } + + ret = device_chld_unbind(dev); + if (ret) + return ret; + + ret = uclass_unbind_device(dev); + if (ret) + return ret; + + if (dev->parent) + list_del(&dev->sibling_node); + free(dev); + + return 0; +} + +/** + * device_free() - Free memory buffers allocated by a device + * @dev: Device that is to be started + */ +static void device_free(struct device *dev) +{ + int size; + + if (dev->driver->priv_auto_alloc_size) { + free(dev->priv); + dev->priv = NULL; + } + if (dev->flags & DM_FLAG_ALLOC_PDATA) { + free(dev->platdata); + dev->platdata = NULL; + } + size = dev->uclass->uc_drv->per_device_auto_alloc_size; + if (size) { + free(dev->uclass_priv); + dev->uclass_priv = NULL; + } +} + +int device_probe(struct device *dev) +{ + struct driver *drv; + int size = 0; + int ret; + + if (!dev) + return -EINVAL; + + if (dev->flags & DM_FLAG_ACTIVATED) + return 0; + + drv = dev->driver; + assert(drv); + + /* Allocate private data and platdata if requested */ + if (drv->priv_auto_alloc_size) { + dev->priv = calloc(1, drv->priv_auto_alloc_size); + if (!dev->priv) { + ret = -ENOMEM; + goto fail; + } + } + /* Allocate private data if requested */ + if (dev->flags & DM_FLAG_ALLOC_PDATA) { + dev->platdata = calloc(1, drv->platdata_auto_alloc_size); + if (!dev->platdata) { + ret = -ENOMEM; + goto fail; + } + } + size = dev->uclass->uc_drv->per_device_auto_alloc_size; + if (size) { + dev->uclass_priv = calloc(1, size); + if (!dev->uclass_priv) { + ret = -ENOMEM; + goto fail; + } + } + + /* Ensure all parents are probed */ + if (dev->parent) { + ret = device_probe(dev->parent); + if (ret) + goto fail; + } + + if (drv->ofdata_to_platdata && dev->of_offset >= 0) { + ret = drv->ofdata_to_platdata(dev); + if (ret) + goto fail; + } + + if (drv->probe) { + ret = drv->probe(dev); + if (ret) + goto fail; + } + + dev->flags |= DM_FLAG_ACTIVATED; + + ret = uclass_post_probe_device(dev); + if (ret) { + dev->flags &= ~DM_FLAG_ACTIVATED; + goto fail_uclass; + } + + return 0; +fail_uclass: + if (device_remove(dev)) { + dm_warn("%s: Device '%s' failed to remove on error path\n", + __func__, dev->name); + } +fail: + device_free(dev); + + return ret; +} + +int device_remove(struct device *dev) +{ + struct driver *drv; + int ret; + + if (!dev) + return -EINVAL; + + if (!(dev->flags & DM_FLAG_ACTIVATED)) + return 0; + + drv = dev->driver; + assert(drv); + + ret = uclass_pre_remove_device(dev); + if (ret) + return ret; + + ret = device_chld_remove(dev); + if (ret) + goto err; + + if (drv->remove) { + ret = drv->remove(dev); + if (ret) + goto err_remove; + } + + device_free(dev); + + dev->flags &= ~DM_FLAG_ACTIVATED; + + return 0; + +err_remove: + /* We can't put the children back */ + dm_warn("%s: Device '%s' failed to remove, but children are gone\n", + __func__, dev->name); +err: + ret = uclass_post_probe_device(dev); + if (ret) { + dm_warn("%s: Device '%s' failed to post_probe on error path\n", + __func__, dev->name); + } + + return ret; +} + +void *dev_get_platdata(struct device *dev) +{ + if (!dev) { + dm_warn("%s: null device", __func__); + return NULL; + } + + return dev->platdata; +} + +void *dev_get_priv(struct device *dev) +{ + if (!dev) { + dm_warn("%s: null device", __func__); + return NULL; + } + + return dev->priv; +} diff --git a/drivers/core/lists.c b/drivers/core/lists.c new file mode 100644 index 0000000..4f2c126 --- /dev/null +++ b/drivers/core/lists.c @@ -0,0 +1,155 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Marek Vasut <marex@denx.de> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <errno.h> +#include <dm/device.h> +#include <dm/device-internal.h> +#include <dm/platdata.h> +#include <dm/uclass.h> +#include <dm/util.h> +#include <linux/compiler.h> + +struct driver *lists_driver_lookup_name(const char *name) +{ + struct driver *drv = + ll_entry_start(struct driver, driver); + const int n_ents = ll_entry_count(struct driver, driver); + struct driver *entry; + int len; + + if (!drv || !n_ents) + return NULL; + + len = strlen(name); + + for (entry = drv; entry != drv + n_ents; entry++) { + if (strncmp(name, entry->name, len)) + continue; + + /* Full match */ + if (len == strlen(entry->name)) + return entry; + } + + /* Not found */ + return NULL; +} + +struct uclass_driver *lists_uclass_lookup(enum uclass_id id) +{ + struct uclass_driver *uclass = + ll_entry_start(struct uclass_driver, uclass); + const int n_ents = ll_entry_count(struct uclass_driver, uclass); + struct uclass_driver *entry; + + if ((id == UCLASS_INVALID) || !uclass) + return NULL; + + for (entry = uclass; entry != uclass + n_ents; entry++) { + if (entry->id == id) + return entry; + } + + return NULL; +} + +int lists_bind_drivers(struct device *parent) +{ + struct driver_info *info = + ll_entry_start(struct driver_info, driver_info); + const int n_ents = ll_entry_count(struct driver_info, driver_info); + struct driver_info *entry; + struct device *dev; + int result = 0; + int ret; + + for (entry = info; entry != info + n_ents; entry++) { + ret = device_bind_by_name(parent, entry, &dev); + if (ret) { + dm_warn("No match for driver '%s'\n", entry->name); + if (!result || ret != -ENOENT) + result = ret; + } + } + + return result; +} + +#ifdef CONFIG_OF_CONTROL +/** + * driver_check_compatible() - Check if a driver is compatible with this node + * + * @param blob: Device tree pointer + * @param offset: Offset of node in device tree + * @param of_matchL List of compatible strings to match + * @return 0 if there is a match, -ENOENT if no match, -ENODEV if the node + * does not have a compatible string, other error <0 if there is a device + * tree error + */ +static int driver_check_compatible(const void *blob, int offset, + const struct device_id *of_match) +{ + int ret; + + if (!of_match) + return -ENOENT; + + while (of_match->compatible) { + ret = fdt_node_check_compatible(blob, offset, + of_match->compatible); + if (!ret) + return 0; + else if (ret == -FDT_ERR_NOTFOUND) + return -ENODEV; + else if (ret < 0) + return -EINVAL; + of_match++; + } + + return -ENOENT; +} + +int lists_bind_fdt(struct device *parent, const void *blob, int offset) +{ + struct driver *driver = ll_entry_start(struct driver, driver); + const int n_ents = ll_entry_count(struct driver, driver); + struct driver *entry; + struct device *dev; + const char *name; + int result = 0; + int ret; + + dm_dbg("bind node %s\n", fdt_get_name(blob, offset, NULL)); + for (entry = driver; entry != driver + n_ents; entry++) { + ret = driver_check_compatible(blob, offset, entry->of_match); + if (ret == -ENOENT) { + continue; + } else if (ret == -ENODEV) { + break; + } else if (ret) { + dm_warn("Device tree error at offset %d\n", offset); + if (!result || ret != -ENOENT) + result = ret; + break; + } + + name = fdt_get_name(blob, offset, NULL); + dm_dbg(" - found match at '%s'\n", entry->name); + ret = device_bind(parent, entry, name, NULL, offset, &dev); + if (ret) { + dm_warn("No match for driver '%s'\n", entry->name); + if (!result || ret != -ENOENT) + result = ret; + } + } + + return result; +} +#endif diff --git a/drivers/core/root.c b/drivers/core/root.c new file mode 100644 index 0000000..407bc0d --- /dev/null +++ b/drivers/core/root.c @@ -0,0 +1,102 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <errno.h> +#include <malloc.h> +#include <dm/device.h> +#include <dm/device-internal.h> +#include <dm/lists.h> +#include <dm/platdata.h> +#include <dm/uclass.h> +#include <dm/util.h> +#include <linux/list.h> + +DECLARE_GLOBAL_DATA_PTR; + +static const struct driver_info root_info = { + .name = "root_driver", +}; + +struct device *dm_root(void) +{ + if (!gd->dm_root) { + dm_warn("Virtual root driver does not exist!\n"); + return NULL; + } + + return gd->dm_root; +} + +int dm_init(void) +{ + int ret; + + if (gd->dm_root) { + dm_warn("Virtual root driver already exists!\n"); + return -EINVAL; + } + INIT_LIST_HEAD(&gd->uclass_root); + + ret = device_bind_by_name(NULL, &root_info, &gd->dm_root); + if (ret) + return ret; + + return 0; +} + +int dm_scan_platdata(void) +{ + int ret; + + ret = lists_bind_drivers(gd->dm_root); + if (ret == -ENOENT) { + dm_warn("Some drivers were not found\n"); + ret = 0; + } + if (ret) + return ret; + + return 0; +} + +#ifdef CONFIG_OF_CONTROL +int dm_scan_fdt(const void *blob) +{ + int offset = 0; + int ret = 0, err; + int depth = 0; + + do { + offset = fdt_next_node(blob, offset, &depth); + if (offset > 0 && depth == 1) { + err = lists_bind_fdt(gd->dm_root, blob, offset); + if (err && !ret) + ret = err; + } + } while (offset > 0); + + if (ret) + dm_warn("Some drivers failed to bind\n"); + + return ret; +} +#endif + +/* This is the root driver - all drivers are children of this */ +U_BOOT_DRIVER(root_driver) = { + .name = "root_driver", + .id = UCLASS_ROOT, +}; + +/* This is the root uclass */ +UCLASS_DRIVER(root) = { + .name = "root", + .id = UCLASS_ROOT, +}; diff --git a/drivers/core/uclass.c b/drivers/core/uclass.c new file mode 100644 index 0000000..4df5a8b --- /dev/null +++ b/drivers/core/uclass.c @@ -0,0 +1,285 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <errno.h> +#include <malloc.h> +#include <dm/device.h> +#include <dm/device-internal.h> +#include <dm/lists.h> +#include <dm/uclass.h> +#include <dm/uclass-internal.h> +#include <dm/util.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct uclass *uclass_find(enum uclass_id key) +{ + struct uclass *uc; + + /* + * TODO(sjg@chromium.org): Optimise this, perhaps moving the found + * node to the start of the list, or creating a linear array mapping + * id to node. + */ + list_for_each_entry(uc, &gd->uclass_root, sibling_node) { + if (uc->uc_drv->id == key) + return uc; + } + + return NULL; +} + +/** + * uclass_add() - Create new uclass in list + * @id: Id number to create + * @ucp: Returns pointer to uclass, or NULL on error + * @return 0 on success, -ve on error + * + * The new uclass is added to the list. There must be only one uclass for + * each id. + */ +static int uclass_add(enum uclass_id id, struct uclass **ucp) +{ + struct uclass_driver *uc_drv; + struct uclass *uc; + int ret; + + *ucp = NULL; + uc_drv = lists_uclass_lookup(id); + if (!uc_drv) { + dm_warn("Cannot find uclass for id %d: please add the UCLASS_DRIVER() declaration for this UCLASS_... id\n", + id); + return -ENOENT; + } + if (uc_drv->ops) { + dm_warn("No ops for uclass id %d\n", id); + return -EINVAL; + } + uc = calloc(1, sizeof(*uc)); + if (!uc) + return -ENOMEM; + if (uc_drv->priv_auto_alloc_size) { + uc->priv = calloc(1, uc_drv->priv_auto_alloc_size); + if (!uc->priv) { + ret = -ENOMEM; + goto fail_mem; + } + } + uc->uc_drv = uc_drv; + INIT_LIST_HEAD(&uc->sibling_node); + INIT_LIST_HEAD(&uc->dev_head); + list_add(&uc->sibling_node, &gd->uclass_root); + + if (uc_drv->init) { + ret = uc_drv->init(uc); + if (ret) + goto fail; + } + + *ucp = uc; + + return 0; +fail: + if (uc_drv->priv_auto_alloc_size) { + free(uc->priv); + uc->priv = NULL; + } + list_del(&uc->sibling_node); +fail_mem: + free(uc); + + return ret; +} + +int uclass_destroy(struct uclass *uc) +{ + struct uclass_driver *uc_drv; + struct device *dev, *tmp; + int ret; + + list_for_each_entry_safe(dev, tmp, &uc->dev_head, uclass_node) { + ret = device_remove(dev); + if (ret) + return ret; + ret = device_unbind(dev); + if (ret) + return ret; + } + + uc_drv = uc->uc_drv; + if (uc_drv->destroy) + uc_drv->destroy(uc); + list_del(&uc->sibling_node); + if (uc_drv->priv_auto_alloc_size) + free(uc->priv); + free(uc); + + return 0; +} + +int uclass_get(enum uclass_id id, struct uclass **ucp) +{ + struct uclass *uc; + + *ucp = NULL; + uc = uclass_find(id); + if (!uc) + return uclass_add(id, ucp); + *ucp = uc; + + return 0; +} + +int uclass_find_device(enum uclass_id id, int index, struct device **devp) +{ + struct uclass *uc; + struct device *dev; + int ret; + + *devp = NULL; + ret = uclass_get(id, &uc); + if (ret) + return ret; + + list_for_each_entry(dev, &uc->dev_head, uclass_node) { + if (!index--) { + *devp = dev; + return 0; + } + } + + return -ENODEV; +} + +int uclass_get_device(enum uclass_id id, int index, struct device **devp) +{ + struct device *dev; + int ret; + + *devp = NULL; + ret = uclass_find_device(id, index, &dev); + if (ret) + return ret; + + ret = device_probe(dev); + if (ret) + return ret; + + *devp = dev; + + return 0; +} + +int uclass_first_device(enum uclass_id id, struct device **devp) +{ + struct uclass *uc; + struct device *dev; + int ret; + + *devp = NULL; + ret = uclass_get(id, &uc); + if (ret) + return ret; + if (list_empty(&uc->dev_head)) + return 0; + + dev = list_first_entry(&uc->dev_head, struct device, uclass_node); + ret = device_probe(dev); + if (ret) + return ret; + *devp = dev; + + return 0; +} + +int uclass_next_device(struct device **devp) +{ + struct device *dev = *devp; + int ret; + + *devp = NULL; + if (list_is_last(&dev->uclass_node, &dev->uclass->dev_head)) + return 0; + + dev = list_entry(dev->uclass_node.next, struct device, uclass_node); + ret = device_probe(dev); + if (ret) + return ret; + *devp = dev; + + return 0; +} + +int uclass_bind_device(struct device *dev) +{ + struct uclass *uc; + int ret; + + uc = dev->uclass; + + list_add_tail(&dev->uclass_node, &uc->dev_head); + + if (uc->uc_drv->post_bind) { + ret = uc->uc_drv->post_bind(dev); + if (ret) { + list_del(&dev->uclass_node); + return ret; + } + } + + return 0; +} + +int uclass_unbind_device(struct device *dev) +{ + struct uclass *uc; + int ret; + + uc = dev->uclass; + if (uc->uc_drv->pre_unbind) { + ret = uc->uc_drv->pre_unbind(dev); + if (ret) + return ret; + } + + list_del(&dev->uclass_node); + return 0; +} + +int uclass_post_probe_device(struct device *dev) +{ + struct uclass_driver *uc_drv = dev->uclass->uc_drv; + + if (uc_drv->post_probe) + return uc_drv->post_probe(dev); + + return 0; +} + +int uclass_pre_remove_device(struct device *dev) +{ + struct uclass_driver *uc_drv; + struct uclass *uc; + int ret; + + uc = dev->uclass; + uc_drv = uc->uc_drv; + if (uc->uc_drv->pre_remove) { + ret = uc->uc_drv->pre_remove(dev); + if (ret) + return ret; + } + if (uc_drv->per_device_auto_alloc_size) { + free(dev->uclass_priv); + dev->uclass_priv = NULL; + } + + return 0; +} diff --git a/drivers/core/util.c b/drivers/core/util.c new file mode 100644 index 0000000..e01dd06 --- /dev/null +++ b/drivers/core/util.c @@ -0,0 +1,37 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <vsprintf.h> + +void dm_warn(const char *fmt, ...) +{ + va_list args; + + va_start(args, fmt); + vprintf(fmt, args); + va_end(args); +} + +void dm_dbg(const char *fmt, ...) +{ + va_list args; + + va_start(args, fmt); + vprintf(fmt, args); + va_end(args); +} + +int list_count_items(struct list_head *head) +{ + struct list_head *node; + int count = 0; + + list_for_each(node, head) + count++; + + return count; +} diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h index 0de0bea..707400e 100644 --- a/include/asm-generic/global_data.h +++ b/include/asm-generic/global_data.h @@ -21,6 +21,8 @@ */ #ifndef __ASSEMBLY__ +#include <linux/list.h> + typedef struct global_data { bd_t *bd; unsigned long flags; @@ -61,6 +63,12 @@ typedef struct global_data { unsigned long start_addr_sp; /* start_addr_stackpointer */ unsigned long reloc_off; struct global_data *new_gd; /* relocated global data */ + +#ifdef CONFIG_DM + struct device *dm_root; /* Root instance for Driver Model */ + struct list_head uclass_root; /* Head of core tree */ +#endif + const void *fdt_blob; /* Our device tree, NULL if none */ void *new_fdt; /* Relocated FDT */ unsigned long fdt_size; /* Space reserved for relocated FDT */ diff --git a/include/dm.h b/include/dm.h new file mode 100644 index 0000000..8bbb21b --- /dev/null +++ b/include/dm.h @@ -0,0 +1,14 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _DM_H_ +#define _DM_H + +#include <dm/device.h> +#include <dm/platdata.h> +#include <dm/uclass.h> + +#endif diff --git a/include/dm/device-internal.h b/include/dm/device-internal.h new file mode 100644 index 0000000..c026e8e --- /dev/null +++ b/include/dm/device-internal.h @@ -0,0 +1,87 @@ +/* + * Copyright (C) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * Marek Vasut <marex@denx.de> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _DM_DEVICE_INTERNAL_H +#define _DM_DEVICE_INTERNAL_H + +struct device; + +/** + * device_bind() - Create a device and bind it to a driver + * + * Called to set up a new device attached to a driver. The device will either + * have platdata, or a device tree node which can be used to create the + * platdata. + * + * Once bound a device exists but is not yet active until device_probe() is + * called. + * + * @parent: Pointer to device's parent, under which this driver will exist + * @drv: Device's driver + * @name: Name of device (e.g. device tree node name) + * @platdata: Pointer to data for this device - the structure is device- + * specific but may include the device's I/O address, etc.. This is NULL for + * devices which use device tree. + * @of_offset: Offset of device tree node for this device. This is -1 for + * devices which don't use device tree. + * @devp: Returns a pointer to the bound device + * @return 0 if OK, -ve on error + */ +int device_bind(struct device *parent, struct driver *drv, + const char *name, void *platdata, int of_offset, + struct device **devp); + +/** + * device_bind_by_name: Create a device and bind it to a driver + * + * This is a helper function used to bind devices which do not use device + * tree. + * + * @parent: Pointer to device's parent + * @info: Name and platdata for this device + * @devp: Returns a pointer to the bound device + * @return 0 if OK, -ve on error + */ +int device_bind_by_name(struct device *parent, const struct driver_info *info, + struct device **devp); + +/** + * device_probe() - Probe a device, activating it + * + * Activate a device so that it is ready for use. All its parents are probed + * first. + * + * @dev: Pointer to device to probe + * @return 0 if OK, -ve on error + */ +int device_probe(struct device *dev); + +/** + * device_remove() - Remove a device, de-activating it + * + * De-activate a device so that it is no longer ready for use. All its + * children are deactivated first. + * + * @dev: Pointer to device to remove + * @return 0 if OK, -ve on error (an error here is normally a very bad thing) + */ +int device_remove(struct device *dev); + +/** + * device_unbind() - Unbind a device, destroying it + * + * Unbind a device and remove all memory used by it + * + * @dev: Pointer to device to unbind + * @return 0 if OK, -ve on error + */ +int device_unbind(struct device *dev); + +#endif diff --git a/include/dm/device.h b/include/dm/device.h new file mode 100644 index 0000000..4cd38ed --- /dev/null +++ b/include/dm/device.h @@ -0,0 +1,159 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * Marek Vasut <marex@denx.de> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _DM_DEVICE_H +#define _DM_DEVICE_H + +#include <dm/uclass-id.h> +#include <linker_lists.h> +#include <linux/list.h> + +struct driver_info; + +/* Driver is active (probed). Cleared when it is removed */ +#define DM_FLAG_ACTIVATED (1 << 0) + +/* DM is responsible for allocating and freeing platdata */ +#define DM_FLAG_ALLOC_PDATA (2 << 0) + +/** + * struct device - An instance of a driver + * + * This holds information about a device, which is a driver bound to a + * particular port or peripheral (essentially a driver instance). + * + * A device will come into existence through a 'bind' call, either due to + * a U_BOOT_DEVICE() macro (in which case platdata is non-NULL) or a node + * in the device tree (in which case of_offset is >= 0). In the latter case + * we translate the device tree information into platdata in a function + * implemented by the driver ofdata_to_platdata method (called just before the + * probe method if the device has a device tree node. + * + * All three of platdata, priv and uclass_priv can be allocated by the + * driver, or you can use the auto_alloc_size members of struct driver and + * struct uclass_driver to have driver model do this automatically. + * + * @driver: The driver used by this device + * @name: Name of device, typically the FDT node name + * @platdata: Configuration data for this device + * @of_offset: Device tree node offset for this device (- for none) + * @parent: Parent of this device, or NULL for the top level device + * @priv: Private data for this device + * @uclass: Pointer to uclass for this device + * @uclass_priv: The uclass's private data for this device + * @uclass_node: Used by uclass to link its devices + * @child_head: List of children of this device + * @sibling_node: Next device in list of all devices + * @flags: Flags for this device DM_FLAG_... + */ +struct device { + struct driver *driver; + const char *name; + void *platdata; + int of_offset; + struct device *parent; + void *priv; + struct uclass *uclass; + void *uclass_priv; + struct list_head uclass_node; + struct list_head child_head; + struct list_head sibling_node; + uint32_t flags; +}; + +/* Returns the operations for a device */ +#define device_get_ops(dev) (dev->driver->ops) + +/* Returns non-zero if the device is active (probed and not removed) */ +#define device_active(dev) ((dev)->flags & DM_FLAG_ACTIVATED) + +/** + * struct device_id - Lists the compatible strings supported by a driver + * @compatible: Compatible string + * @data: Data for this compatible string + */ +struct device_id { + const char *compatible; + ulong data; +}; + +/** + * struct driver - A driver for a feature or peripheral + * + * This holds methods for setting up a new device, and also removing it. + * The device needs information to set itself up - this is provided either + * by platdata or a device tree node (which we find by looking up + * matching compatible strings with of_match). + * + * Drivers all belong to a uclass, representing a class of devices of the + * same type. Common elements of the drivers can be implemented in the uclass, + * or the uclass can provide a consistent interface to the drivers within + * it. + * + * @name: Device name + * @id: Identiies the uclass we belong to + * @of_match: List of compatible strings to match, and any identifying data + * for each. + * @bind: Called to bind a device to its driver + * @probe: Called to probe a device, i.e. activate it + * @remove: Called to remove a device, i.e. de-activate it + * @unbind: Called to unbind a device from its driver + * @ofdata_to_platdata: Called before probe to decode device tree data + * @priv_auto_alloc_size: If non-zero this is the size of the private data + * to be allocated in the device's ->priv pointer. If zero, then the driver + * is responsible for allocating any data required. + * @platdata_auto_alloc_size: If non-zero this is the size of the + * platform data to be allocated in the device's ->platdata pointer. + * This is typically only useful for device-tree-aware drivers (those with + * an of_match), since drivers which use platdata will have the data + * provided in the U_BOOT_DEVICE() instantiation. + * ops: Driver-specific operations. This is typically a list of function + * pointers defined by the driver, to implement driver functions required by + * the uclass. + */ +struct driver { + char *name; + enum uclass_id id; + const struct device_id *of_match; + int (*bind)(struct device *dev); + int (*probe)(struct device *dev); + int (*remove)(struct device *dev); + int (*unbind)(struct device *dev); + int (*ofdata_to_platdata)(struct device *dev); + int priv_auto_alloc_size; + int platdata_auto_alloc_size; + const void *ops; /* driver-specific operations */ +}; + +/* Declare a new U-Boot driver */ +#define U_BOOT_DRIVER(__name) \ + ll_entry_declare(struct driver, __name, driver) + +/** + * dev_get_platdata() - Get the platform data for a device + * + * This checks that dev is not NULL, but no other checks for now + * + * @dev Device to check + * @return platform data, or NULL if none + */ +void *dev_get_platdata(struct device *dev); + +/** + * dev_get_priv() - Get the private data for a device + * + * This checks that dev is not NULL, but no other checks for now + * + * @dev Device to check + * @return private data, or NULL if none + */ +void *dev_get_priv(struct device *dev); + +#endif diff --git a/include/dm/lists.h b/include/dm/lists.h new file mode 100644 index 0000000..0d09f9a --- /dev/null +++ b/include/dm/lists.h @@ -0,0 +1,39 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _DM_LISTS_H_ +#define _DM_LISTS_H_ + +#include <dm/uclass-id.h> + +/** + * lists_driver_lookup_name() - Return u_boot_driver corresponding to name + * + * This function returns a pointer to a driver given its name. This is used + * for binding a driver given its name and platdata. + * + * @name: Name of driver to look up + * @return pointer to driver, or NULL if not found + */ +struct driver *lists_driver_lookup_name(const char *name); + +/** + * lists_uclass_lookup() - Return uclass_driver based on ID of the class + * id: ID of the class + * + * This function returns the pointer to uclass_driver, which is the class's + * base structure based on the ID of the class. Returns NULL on error. + */ +struct uclass_driver *lists_uclass_lookup(enum uclass_id id); + +int lists_bind_drivers(struct device *parent); + +int lists_bind_fdt(struct device *parent, const void *blob, int offset); + +#endif diff --git a/include/dm/platdata.h b/include/dm/platdata.h new file mode 100644 index 0000000..0ef3353 --- /dev/null +++ b/include/dm/platdata.h @@ -0,0 +1,22 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * Marek Vasut <marex@denx.de> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _DM_PLATDATA_H +#define _DM_PLATDATA_H + +struct driver_info { + const char *name; + const void *platdata; +}; + +#define U_BOOT_DEVICE(__name) \ + ll_entry_declare(struct driver_info, __name, driver_info) + +#endif diff --git a/include/dm/root.h b/include/dm/root.h new file mode 100644 index 0000000..0ebccda --- /dev/null +++ b/include/dm/root.h @@ -0,0 +1,53 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _DM_ROOT_H_ +#define _DM_ROOT_H_ + +struct device; + +/** + * dm_root() - Return pointer to the top of the driver tree + * + * This function returns pointer to the root node of the driver tree, + * + * @return pointer to root device, or NULL if not inited yet + */ +struct device *dm_root(void); + +/** + * dm_scan_platdata() - Scan all platform data and bind drivers + * + * This scans all available platdata and creates drivers for each + * + * @return 0 if OK, -ve on error + */ +int dm_scan_platdata(void); + +/** + * dm_scan_fdt() - Scan the device tree and bind drivers + * + * This scans the device tree and creates a driver for each node + * + * @blob: Pointer to device tree blob + * @return 0 if OK, -ve on error + */ +int dm_scan_fdt(const void *blob); + +/** + * dm_init() - Initialize Driver Model structures + * + * This function will initialize roots of driver tree and class tree. + * This needs to be called before anything uses the DM + * + * @return 0 if OK, -ve on error + */ +int dm_init(void); + +#endif diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h new file mode 100644 index 0000000..f0e691c --- /dev/null +++ b/include/dm/uclass-id.h @@ -0,0 +1,28 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _DM_UCLASS_ID_H +#define _DM_UCLASS_ID_H + +/* TODO(sjg@chromium.org): this could be compile-time generated */ +enum uclass_id { + /* These are used internally by driver model */ + UCLASS_ROOT = 0, + UCLASS_DEMO, + UCLASS_TEST, + UCLASS_TEST_FDT, + + /* U-Boot uclasses start here */ + UCLASS_GPIO, + + UCLASS_COUNT, + UCLASS_INVALID = -1, +}; + +#endif diff --git a/include/dm/uclass-internal.h b/include/dm/uclass-internal.h new file mode 100644 index 0000000..cc65d52 --- /dev/null +++ b/include/dm/uclass-internal.h @@ -0,0 +1,85 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _DM_UCLASS_INTERNAL_H +#define _DM_UCLASS_INTERNAL_H + +/** + * uclass_find_device() - Return n-th child of uclass + * @id: Id number of the uclass + * @index: Position of the child in uclass's list + * #devp: Returns pointer to device, or NULL on error + * + * The device is not prepared for use - this is an internal function + * + * @return the uclass pointer of a child at the given index or + * return NULL on error. + */ +int uclass_find_device(enum uclass_id id, int index, struct device **devp); + +/** + * uclass_bind_device() - Associate device with a uclass + * + * Connect the device into uclass's list of devices. + * + * @dev: Pointer to the device + * #return 0 on success, -ve on error + */ +int uclass_bind_device(struct device *dev); + +/** + * uclass_unbind_device() - Deassociate device with a uclass + * + * Disconnect the device from uclass's list of devices. + * + * @dev: Pointer to the device + * #return 0 on success, -ve on error + */ +int uclass_unbind_device(struct device *dev); + +/** + * uclass_post_probe_device() - Deal with a device that has just been probed + * + * Perform any post-processing of a probed device that is needed by the + * uclass. + * + * @dev: Pointer to the device + * #return 0 on success, -ve on error + */ +int uclass_post_probe_device(struct device *dev); + +/** + * uclass_pre_remove_device() - Handle a device which is about to be removed + * + * Perform any pre-processing of a device that is about to be removed. + * + * @dev: Pointer to the device + * #return 0 on success, -ve on error + */ +int uclass_pre_remove_device(struct device *dev); + +/** + * uclass_find() - Find uclass by its id + * + * @id: Id to serach for + * @return pointer to uclass, or NULL if not found + */ +struct uclass *uclass_find(enum uclass_id key); + +/** + * uclass_destroy() - Destroy a uclass + * + * Destroy a uclass and all its devices + * + * @uc: uclass to destroy + * @return 0 on success, -ve on error + */ +int uclass_destroy(struct uclass *uc); + +#endif diff --git a/include/dm/uclass.h b/include/dm/uclass.h new file mode 100644 index 0000000..cd23cfe --- /dev/null +++ b/include/dm/uclass.h @@ -0,0 +1,142 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * (C) Copyright 2012 + * Pavel Herrmann <morpheus.ibis@gmail.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _DM_UCLASS_H +#define _DM_UCLASS_H + +#include <dm/uclass-id.h> +#include <linux/list.h> + +/** + * struct uclass - a U-Boot drive class, collecting together similar drivers + * + * A uclass provides an interface to a particular function, which is + * implemented by one or more drivers. Every driver belongs to a uclass even + * if it is the only driver in that uclass. An example uclass is GPIO, which + * provides the ability to change read inputs, set and clear outputs, etc. + * There may be drivers for on-chip SoC GPIO banks, I2C GPIO expanders and + * PMIC IO lines, all made available in a unified way through the uclass. + * + * @priv: Private data for this uclass + * @uc_drv: The driver for the uclass itself, not to be confused with a + * 'struct driver' + * dev_head: List of devices in this uclass (devices are attached to their + * uclass when their bind method is called) + * @sibling_node: Next uclass in the linked list of uclasses + */ +struct uclass { + void *priv; + struct uclass_driver *uc_drv; + struct list_head dev_head; + struct list_head sibling_node; +}; + +struct device; + +/** + * struct uclass_driver - Driver for the uclass + * + * A uclass_driver provides a consistent interface to a set of related + * drivers. + * + * @name: Name of uclass driver + * @id: ID number of this uclass + * @post_bind: Called after a new device is bound to this uclass + * @pre_unbind: Called before a device is unbound from this uclass + * @post_probe: Called after a new device is probed + * @pre_remove: Called before a device is removed + * @init: Called to set up the uclass + * @destroy: Called to destroy the uclass + * @priv_auto_alloc_size: If non-zero this is the size of the private data + * to be allocated in the uclass's ->priv pointer. If zero, then the uclass + * driver is responsible for allocating any data required. + * @per_device_auto_alloc_size: Each device can hold private data owned + * by the uclass. If required this will be automatically allocated if this + * value is non-zero. + * @ops: Uclass operations, providing the consistent interface to devices + * within the uclass. + */ +struct uclass_driver { + const char *name; + enum uclass_id id; + int (*post_bind)(struct device *dev); + int (*pre_unbind)(struct device *dev); + int (*post_probe)(struct device *dev); + int (*pre_remove)(struct device *dev); + int (*init)(struct uclass *class); + int (*destroy)(struct uclass *class); + int priv_auto_alloc_size; + int per_device_auto_alloc_size; + const void *ops; +}; + +/* Declare a new uclass_driver */ +#define UCLASS_DRIVER(__name) \ + ll_entry_declare(struct uclass_driver, __name, uclass) + +/** + * uclass_get() - Get a uclass based on an ID, creating it if needed + * + * Every uclass is identified by an ID, a number from 0 to n-1 where n is + * the number of uclasses. This function allows looking up a uclass by its + * ID. + * + * @key: ID to look up + * @ucp: Returns pointer to uclass (there is only one per ID) + * @return 0 if OK, -ve on error + */ +int uclass_get(enum uclass_id key, struct uclass **ucp); + +/** + * uclass_get_device() - Get a uclass device based on an ID and index + * + * id: ID to look up + * @index: Device number within that uclass (0=first) + * @ucp: Returns pointer to uclass (there is only one per for each ID) + * @return 0 if OK, -ve on error + */ +int uclass_get_device(enum uclass_id id, int index, struct device **ucp); + +/** + * uclass_first_device() - Get the first device in a uclass + * + * @id: Uclass ID to look up + * @devp: Returns pointer to the first device in that uclass, or NULL if none + * @return 0 if OK (found or not found), -1 on error + */ +int uclass_first_device(enum uclass_id id, struct device **devp); + +/** + * uclass_next_device() - Get the next device in a uclass + * + * @devp: On entry, pointer to device to lookup. On exit, returns pointer + * to the next device in the same uclass, or NULL if none + * @return 0 if OK (found or not found), -1 on error + */ +int uclass_next_device(struct device **devp); + +/** + * uclass_foreach_dev() - Helper function to iteration through devices + * + * This creates a for() loop which works through the available devices in + * a uclass in order from start to end. + * + * @pos: struct device * to hold the current device. Set to NULL when there + * are no more devices. + * uc: uclass to scan + */ +#define uclass_foreach_dev(pos, uc) \ + for (pos = list_entry((&(uc)->dev_head)->next, typeof(*pos), \ + uclass_node); \ + prefetch(pos->uclass_node.next), \ + &pos->uclass_node != (&(uc)->dev_head); \ + pos = list_entry(pos->uclass_node.next, typeof(*pos), \ + uclass_node)) + +#endif diff --git a/include/dm/util.h b/include/dm/util.h new file mode 100644 index 0000000..8be64a9 --- /dev/null +++ b/include/dm/util.h @@ -0,0 +1,29 @@ +/* + * Copyright (c) 2013 Google, Inc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __DM_UTIL_H + +void dm_warn(const char *fmt, ...); + +#ifdef DEBUG +void dm_dbg(const char *fmt, ...); +#else +static inline void dm_dbg(const char *fmt, ...) +{ +} +#endif + +struct list_head; + +/** + * list_count_items() - Count number of items in a list + * + * @param head: Head of list + * @return number of items, or 0 if empty + */ +int list_count_items(struct list_head *head); + +#endif |